Top Laws of Motion Questions for NEET
The chapter Laws of Motion is one of the most fundamental and high-scoring areas in NEET Physics. Every year, multiple questions are directly asked from this unit or indirectly linked to it through mechanics-based problems. A strong command over this chapter ensures that you can confidently tackle questions from friction, circular motion, work-energy, and even rotational mechanics. This article on Top 5 Laws of Motion Questions is designed to give you conceptual clarity, exposure to most expected PYQs, and enough practice to make you exam-ready.
Understanding the Top 5 Laws of Motion Questions is not about memorizing solutions but about developing a clear approach using Newton’s Laws. Once your basics are strong, even complex problems become straightforward.
Importance of Laws of Motion for NEET
Before diving into the Top 5 Laws of Motion Questions, it is essential to understand why this chapter is crucial. Laws of Motion act as the backbone of mechanics. Most NEET aspirants lose marks here not because the questions are difficult, but because they lack clarity in concepts like free body diagrams, friction, and force analysis.
Practicing the Top 5 Laws of Motion Questions repeatedly ensures that you build both speed and accuracy, which are key for scoring high in NEET Physics.
Top 5 Laws of Motion Questions (With Detailed Concepts)
Question 1: Block on a Rough Surface
A block of mass 5 kg is placed on a rough horizontal surface. A force of 20 N is applied, but the block does not move. The coefficient of static friction is 0.5. Find the frictional force acting on the block.
This is a classic example included in the Top 5 Laws of Motion Questions to test your understanding of static friction. Many students directly calculate friction as μN, which is incorrect unless the body is about to move.
Maximum static friction = μN = 0.5 × (5 × 10) = 25 N. However, the applied force is only 20 N. Since static friction is a self-adjusting force, it matches the applied force as long as it is below the limiting value.
Therefore, the frictional force acting on the block is 20 N. This question highlights the importance of conceptual clarity in the Top 5 Laws of Motion Questions.
Question 2: Two Blocks System
Two blocks of masses 2 kg and 3 kg are connected by a string and pulled with a force of 10 N on a frictionless surface. Find the acceleration of the system.
This is one of the most frequently asked patterns in the Top 5 Laws of Motion Questions. Here, both blocks move together as a single system.
Total mass = 2 + 3 = 5 kg. Using Newton’s Second Law, acceleration = F / m = 10 / 5 = 2 m/s². The simplicity of this problem makes it scoring, provided you correctly treat the system as one unit.
Question 3: Tension in the String
Using the same system as above, find the tension in the string between the blocks.
This is a follow-up question often paired with system problems in the Top 5 Laws of Motion Questions. To find tension, isolate one block (say 2 kg).
Using F = ma, T = 2 × 2 = 4 N. This question emphasizes internal force analysis and is extremely important for NEET.
Question 4: Elevator Problem
A person of mass 60 kg is standing in an elevator accelerating upward with 2 m/s². Find the apparent weight.
Elevator problems are a staple in the Top 5 Laws of Motion Questions. These test your understanding of non-inertial frames.
Apparent weight = m(g + a) = 60 × (10 + 2) = 720 N. The key idea here is that upward acceleration increases normal reaction, hence increasing apparent weight.
Question 5: Inclined Plane with Friction
A block is placed on an inclined plane of angle 30°. The coefficient of friction is 0.2. Determine whether the block will slide.
This is one of the most conceptual problems in the Top 5 Laws of Motion Questions. The comparison is between downward force and friction.
Downward component = mg sinθ = 0.5 mg. Friction = μmg cosθ = 0.2 × 0.866 mg = 0.1732 mg. Since 0.5 mg is greater than friction, the block will slide.
Concept Summary for Quick Revision
The Top 5 Laws of Motion Questions discussed above cover the most important concepts required for NEET:
Static and kinetic friction, connected systems, tension analysis, elevator dynamics, and inclined plane motion. If you are comfortable with these, you can solve a majority of NEET questions from this chapter with ease.
Additional Practice Questions (Concept-Based Rapid Revision with Solutions)
To strengthen your preparation further, here are additional problems based on the Top 5 Laws of Motion Questions, each with complete solutions.
Question 1
A 10 kg block is pulled with a force of 50 N on a frictionless surface. Find acceleration.
Using Newton’s Second Law, a = F / m = 50 / 10 = 5 m/s².
Answer: 5 m/s²
Question 2
Two blocks of 4 kg and 6 kg are connected and pulled with 20 N force. Find tension.
Total mass = 10 kg, acceleration = 2 m/s². Tension on 4 kg block = 4 × 2 = 8 N.
Answer: 8 N
Question 3
A body moves with constant velocity. What is the net force?
Acceleration = 0, hence force = 0.
Answer: 0 N
Question 4
A lift moves downward with acceleration. What happens to apparent weight?
Apparent weight = m(g − a), hence it decreases.
Answer: Decreases
Question 5
A block is just about to move. What is friction acting?
Friction = maximum static friction = μN.
Answer: Maximum static friction
Question 6
Two masses (2 kg and 3 kg) are connected over a pulley. Find acceleration.
a=m1+m2(m2−m1)g
Substituting values gives a = 2 m/s².
Answer: 2 m/s²
Question 7
A man pushes a wall but it does not move. Is work done?
Work = Force × Displacement = 0.
Answer: No
Question 8
A block slides down an incline with friction. Find acceleration.
a=g(sinθ−μcosθ)
Substituting values gives a ≈ 3.27 m/s².
Answer: 3.27 m/s²
Question 9
If force is doubled and mass is halved, what happens to acceleration?
a = F/m → new acceleration = 4a.
Answer: 4 times
Question 10
A block is in equilibrium under three forces. What is the condition?
Vector sum of forces must be zero.
Answer: Net force = 0
Preparation Strategy Using Top 5 Laws of Motion Questions
To master the Top 5 Laws of Motion Questions, always begin with clear free body diagrams. Identify all forces correctly before applying equations. Practice multiple variations of each type and revise formulas daily. Consistent practice of the Top 5 Laws of Motion Questions will ensure that you develop both conceptual clarity and numerical accuracy.
Common Mistakes to Avoid
While preparing through the Top 5 Laws of Motion Questions, students often confuse static and kinetic friction, forget to resolve forces on inclined planes, or misinterpret acceleration direction. Avoiding these small mistakes can significantly boost your score.
Final Thoughts
The Top 5 Laws of Motion Questions presented here represent the most important patterns asked in NEET. Mastering these ensures that you are well-prepared for both direct and application-based questions. Regular revision and practice of these questions will make this chapter one of your strongest scoring areas.
FAQ Section
What is the weightage of Laws of Motion in NEET?
It usually contributes 2–3 questions every year.
How to prepare Top 5 Laws of Motion Questions effectively?
Focus on concepts, solve PYQs, and practice variations regularly.
Are these questions enough for NEET?
They form a strong base, but additional practice is recommended.